package cs1;

public class a1 {

	public static void main(String[] args) {
	int x=0;
		int num = 0;
	/*	while(x<=100){
			if(x%2==0)
			 num=x+num;
			x++;
		}
		System.out.println(num);*/
		do {
			if(x%2==0)
			num=x+num;
			x++;
		}
		while(x<=100);	
			System.out.println(num);
	}
}

/*int q=0;
for( int i=0;i<str.length()-3;i++){
	   if(str.substring(i,i+2).equals("co")&&str.charAt(i+3)=='e'){
	    q++;
	   }
	  }return q;*/